风廓线雷达大气风场观测误差分析

依据风廓线雷达工作原理和风的计算公式,分析影响大气风场观测误差的主要因素,重点分析了雷达回波SNR对风的观测精度影响和GPS探空对比试验。结果表明:①风速观测精度主要取决于波束倾角、雷达技术参数和大气折射率结构常数C2n的垂直分布;风速及风速观测精度越大,风向观测精度越大。②在同种观测模式下,波束倾角与C2n越大,风场观测精度越高。③同一观测模式的SNR越大,风速观测误差越小;不同模式间的大气风场观测精度相差较大。④对比试验的风速风向相关性较好,但相对偏差较大,尤其低空更为明显。

Wind Profiler Radar Observation Error Analysis of Atmospheric Wind Fields

Based on the wind profiler radar working principles and wind formulas, the main factors affecting atmospheric wind field observation errors are studied, and the effect of radar echo signal-to-noise ratio （SNR） on wind observation accuracy and GPS sounding comparison test is analyzed. The conclusions are as follows： （1） Wind speed observation accuracy is mainly depended on the beam tilt angle, radar technical parameters, and the vertical distribution of Cn2 （refractive index structure parameter） ; the greater the wind speed and wind speed accuracy, the greater the accuracy of wind direction. （2） In the same observation mode, the greater the beam tilt angle and Cn2, the higher the accuracy of the wind field observations. （3） The greater radar echo SNR, the smaller the accuracy of wind speed. There is large difference in wind observation error between different modes. （4） There is good correlation between wind speed and direction in the comparative test, but the relative deviation is obvious, especially at low altitudes.